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. Making statements based on opinion; back them up with references or personal experience. I started with the hydrate, heated it in the evap dish over a flame (using a gas cooker ring) until it had all turned greyish white, then allowed it to cool and weighed again. Measured mass of crucible with anhydrous copper sulfate: 37.3005g Find out the importance of drinking plenty of water and the adverse health effects of not getting enough water. If the results of your calculations suggest that you have some water left in the residue, reheat your sample for an additional 5 minutes, allow it to cool down and weigh it again. The weight after cooling of the evap dish is constant. Let's face it, percent composition and empirical formulas are not the most exciting concepts to teach in chemistry. Hypothesis (answer in a complete sentence in lab book). The difference between 5.00 and 5.16 is a weight error of about 200mg, and I was really careful, so this seems unlikely. So the practical involved taking hydrated copper sulphate, heating it to drive off the water, weighing before and after, and thus calculating the number of water molecules of crystallisation, based on the respective molecular weights of the anhydrous salt and water. The reaction occurred and 2.4469 grams of solid copper, Cu, precipitated; therefore, showing that the limiting reagent was iron. Naming and Formulas: Simple Ionic and Covalent Compounds In this lab and unknown hydrate will be heated two separate times over a Bunsen burner to remove as much water from the substance as possible, before and after heating the crucible the masses will be calculated and recorded for future reference. By comparing the mass lost to the mass of anhydrous salt left behind, we can calculate the percentage of water within the hydrated salt. * Candle temperature change caused by the reaction is hard to measure. Our goal is to determine this value by comparing the moles of copper sulfate (anhydrate) to the moles of water. left exposed for any length of time. Chemistry Honors Thanks for contributing an answer to Chemistry Stack Exchange! Building on previous knowledge of ions and formulas from Part One & Two are included in the Exit Ticket and the Homework. The water present in the latter case is called water of hydration or water of crystallization. Improving the copy in the close modal and post notices - 2023 edition, New blog post from our CEO Prashanth: Community is the future of AI. (8 points) Two forms of this lab included for student differentiation.